This comment reveals a lot about your own biases and prejudices, and really perfectly demonstrates why social justice warriors are so toxic to fandoms. You assume that the reaction to Thor is sexist, and are baffled by the lack of a "racist" reaction to "black Captain America."

It's obvious that you've bought into a lot of toxic nonsense about fanboys, and aren't really a member of the fandom. Otherwise you'd understand exactly why no one is complaining about "black Captain America" and everyone is complaining about "girl Thor."

No one cares about "black Captain America" because someone always takes up the mantle of Captain America when Steve Rogers abandons it. This time that person is Sam Wilson, who has been fighting alongside Steve for decades, is a hugely important character in the series, and totally deserves to take up the mantle.

The problem with Thorina is that it doesn't make any sense in terms of the history of the character. Picking up Mjolnir does not transform a person into Thor -- it gives them a Thor-like costume and the powers of Thor, but they keep their own identity. For example, when Wonder Woman picked up the hammer, she did not become Thor. Her costume changed and she got Thor's powers, but remained Diana. Same thing with Beta Ray Bill. Same thing with Captain America.

Where people get confused is that four normal human beings who have weilded Thor's hammer have become Thor Odinson. These four men were Donald Blake, Eric Masterson, Jake Olsen and Red Norvell. What is very important to understand is that none of these men became Thor because they picked up Mjlonir.

Instead, all four of these men ("Wielders") had become merged with Thor Odinson by various means. In all four cases Thor Odinson and the the Wielder had become merged into one being, with the Thor personality only coming out when the powers were active.

Donald Blake was Thor's spirit trapped in a mortal form as a punishment by Odin. Eric Masterson became Thor when Odin sealed Thor Odinson into Eric's mind in order to save Eric's life. Jake Olsen was possessed by Thor's soul due to complex manipulations by Hela when Jake and Thor were both killed by the Destroyer in the same battle. Red Norvell became Thor because Odin worked some messed up magic in an attempt to save Thor from Ragnarok by letting Red die in his place.

Supposedly female Thor gained the identity of Thor by lifting the hammer, and Thor Odinson is still wandering about not trapped inside her head. She doesn't gain his body when she gains his powers, unlike every other mortal that actually became Thor.

She is not Thor. She is some other character who has mjolnir and Thor's powers, but she is not Thor. Thor Odinson, the dude she is tapping in the chest in the linked image, is Thor. To say that she is Thor is to ignore the entire Thor canon. It's completely ridiculous.

And like all shitty writers who have ever gotten their hands on a comic and shat all over canon, the writer of Thor is getting a lot of grief for it. And like every SJW writer who gets grief for violating canon, he and his fans are trying to hide behind calling everyone else sexists and racists, when the reality is we're just bigger comic book fans that you morons.